/*
 * Copyright (c) 2025 Huawei Technologies Co., Ltd.
 * This program is free software, you can redistribute it and/or modify it under the terms and conditions of
 * CANN Open Software License Agreement Version 2.0 (the "License").
 * Please refer to the License for details. You may not use this file except in compliance with the License.
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
 * See LICENSE in the root of the software repository for the full text of the License.
 */

#include "ascir/Dialect/Asc/IR/Asc.h"
#include "ascir/Dialect/Asc/Transforms/Passes.h"
#include "ascir/Dialect/Utils/ConstantOpBuilder.h"

#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/IR/Builders.h"

namespace mlir {
namespace ascendc {
#define GEN_PASS_DEF_UNIFYPIPE
#include "ascir/Dialect/Asc/Transforms/Passes.h.inc"
}  // namespace ascendc
}  // namespace mlir

using namespace mlir;

namespace {

void unifyPipe(func::FuncOp root) {
  SmallVector<ascendc::PipeOp> pipes;
  root.walk([&pipes](ascendc::PipeOp op) { pipes.push_back(op); });
  if (pipes.size() <= 1) {
    return;
  }
  auto builder = OpBuilder::atBlockBegin(&root.getBody().front());
  Value uniPipe = builder.create<ascendc::PipeOp>(builder.getUnknownLoc());
  for (auto pipe : pipes) {
      pipe.replaceAllUsesWith(uniPipe);
      pipe.erase();
  }
}

class UnifyPipePass
    : public ascendc::impl::UnifyPipeBase<UnifyPipePass> {
  void runOnOperation() override {
    unifyPipe(getOperation());
  }
};

} // namespace

namespace mlir {
namespace ascendc {
std::unique_ptr<Pass> createUnifyPipePass() {
  return std::make_unique<UnifyPipePass>();
}
} // namespace ascendc
} // namespace mlir
